JEE PHYSICS UNIT 4: WORK, ENERGY AND POWER
QUIZ NO 3
TOTAL QUESTIONS = 20


1. A ball is thrown vertically upward. At its highest point, which of the following is true


2. Work done in lifting a body against gravity depends on


3. If the velocity of an object is doubled, its kinetic energy becomes


4. Work done by a force is given as 50 J. If the displacement is 5 m and the force acts along the displacement, find the magnitude of the force


5. The unit of energy in the SI system is


6. A simple pendulum is lifted to a certain height. If it oscillates, which force converts potential energy to kinetic energy


7. The power output of a machine that lifts a mass of 50 kg vertically at a constant speed of 5 m/s is


8. A spring of spring constant 200 N/m is compressed by 0.1 m. The potential energy stored in the spring is


9. A block of mass 10 kg is released from rest from the top of a 5 m high incline. Neglecting friction, the velocity at the bottom is approximately


10. A satellite revolving around the Earth in a circular orbit has constant


11. A body is in uniform circular motion. Which of the following is true about the work done by centripetal force


12. A motor lifts a 2 kg object at a constant velocity of 5 m/s. The power output of the motor is


13. A 5 kg block is dragged across a surface with a coefficient of friction μ = 0.2. If the block is moved by 10 m, the work done against friction is


14. A force of 20 N displaces a body by 2 m at an angle of 60° to the force. The work done by the force is


15. A spring is compressed by 0.1 m. If its spring constant is 150 N/m, calculate the potential energy stored


16. A block is lifted vertically upward with constant speed. The work done by the tension in the string is


17. Which of the following forces is a conservative force


18. The unit of power in the SI system is


19. A 2 kg block is placed on a table and pushed horizontally by a force of 20 N across a distance of 3 m. The work done is


20. The dot product of force and displacement is zero if



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